Help with square thermostatic cartridge removal.

[Basher]

the valve is still changing the temperature, but the output doesn't get hot enough any more, also at absolute max setting, it's still not hot enough.
That’s why I thought it has to be the cartridge

If you take the knob off, can you turn the shaft of the cartridge up (ie in the hotter direction) any further?
I just wondered if it was where the knob has been put on that is stopping it being turned up.
May not apply to your model though - could be worth a try?
Other than that, and assuming the hot water is hot enough, I'm afraid I don't have any other suggestions

 

[GabeBury]

If you take the knob off, can you turn the shaft of the cartridge up (ie in the hotter direction) any further?
I just wondered if it was where the knob has been put on that is stopping it being turned up.
May not apply to your model though - could be worth a try?
Other than that, and assuming the hot water is hot enough, I'm afraid I don't have any other suggestions

If i take the knob off,I can turn the shaft of the cartridge up (ie in the hotter direction) and same result. Don’t you agree it could be a faulty thermostat cartridge.?

 

[Basher]

If i take the knob off,I can turn the shaft of the cartridge up (ie in the hotter direction) and same result. Don’t you agree it could be a faulty thermostat cartridge.?

Yes, I do agree, could indeed be. As long as the hot water is really hot, that seems to be the only explanation!
Can you return the faulty one to the plumber or supplier of the shower to get a replacement f.o.c.?

 

[GabeBury]

Thanks, I shall update the thread once I tried relacing the cartridge, just waiting on the box spanner to arrive.

 

[GabeBury]

Yes, I do agree, could indeed be. As long as the hot water is really hot, that seems to be the only explanation!
Can you return the faulty one to the plumber or supplier of the shower to get a replacement f.o.c.?

Hello, I managed to change it, there is a hot water now, but when I open the flow valve to the max I hear a hard knocks, I believe it’s a pressure issue, could a cartridge cause such a thing .?

 

[Basher]

Hello, I managed to change it, there is a hot water now, but when I open the flow valve to the max I hear a hard knocks, I believe it’s a pressure issue, could a cartridge cause such a thing .?

Well done for sorting it.
It's possible there are/were entrapped air pockets in the water after changing the valve, that could cause such noises.
However that should go away after first use.
I'm not aware that a ceramic cartridge valve, or thermostatic valve, can cause such a thing.
Maybe others may know?